Power transmitting or driving belt



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Fa. RIDERWALD POWER TRANSMITTING OR DRIVING BELT Filed June 23 i925 2 Sheets-Sheet l www? for msmzo Jan. l0, 1928.

R. RODERWALD POWER TRANSMITTING OR DRIVING BELT Filed June 23 1925 2 Smets-Sheet 2 EN wel@ @w1/ Raggi/ff www@ Off w ments for driving the Patented Jan. 10, 1928. i

y UNITED STATES RUDOLF RODERWALD, F BERLIN, GERMANY.

yrowiin TRANSMITTING on DRIVING BELT.

Application led June 23, 1925, Serial No. 39,005, and in Germany August 27, 1924.

My invention relates to improvements in l power transmitting belts of the V-type adapted particularl to transmit power from an axis of rai way-cars to a grooved wheel provided on a dynamo shaft for driving the same, although capable of various other uses.

I am aware, that heretofore many attempts have been made to comply with the requireynamos of railwaycars, but all known belts are indeed not 'adapted to fulfill these requirements, the reason thereof being, that such belts are exposed to the weather and to the fact, that M the distance between the axle of the car and the, car-body supporting the dynamo varies when the car is running through curves and the like. Metallic ybands with frictional bodies thereon do not have the required eX- pansion, and bands made of other material have butfshort life, the reason being, that the frictional bodies are usually fastened by rivets or'screws tov the band. This method of fastening weakens the supporting section au of the band and, moreover, bodies fastened in such manner are pulled off in a short time.

A further difficulty tobe overcome is to securely interconnect the ends of a band of so the usual material.

f or wea ened.,

It is a further object of my invention to interconnect the ends of the belt, in a novel manner so that the end-member does not dier in its outerdimensions from the other frictional bodies.

With the foregoing and other objects in view, the invention will be more fully described hereinafter, and will be more particularly pointed out in the claims appended hereto.

In the drawings, wherein like symbols refer to like or corresponding parts throughout the several views, K Figure 1 is a side elevation of ya portion of a belt constructed according to this invention. Y Figure 2 is a transverse section taken through the same.

Figure 3 is a similar view of a modification of the same.

Figure 4 is a side elevation of another modification of the belt.,

Figure 5 is a top plan view of the same.,

Figure 6 is a side Velevation of a further mod iied form of the invention.

Figure 7 is a top plan view of the same.

Figure 8 is a transverse section through the same. p

Figure 9 is an enlarged side elevation partly in section of a still further modified form of the belt.

Figure 10 is a transversesection therethrough, and

Figure 11 is a further enlarged cross section through the latter form of belt.

Referring to the drawings 4 designates the band or lengthwise extending portion of the belt which is made up of a plurality of layers of fabric impregnated with rubber, and wherein, preferably, no metal is employed On this band 4 are secured in suitable spaced apart relation a plurality of frictional bodies 16, which are of rubber or rubber composition and which are vulcanized upon the band 4, so as to hold the bodies 16 firmly thereto and in proper relation with respect to each other without the use of separate fastening devices. It will be noted that by this construction the connection is a solid one and the band 4 is not distorted or weakened by perforations, such as caused by rivets, bolts and the like.

In the form shown in Figures 1 and 2, the band 4 passes through the upper portions of the bodies 16 and the latter have their lateral faces converging inwardly toward the working surface of the belt and the lower corners of the bodies are rounded off, as shown to advantage in Figure 2. y

In the modification shown in Figure 3, the bodies 16 are preferably cylindrical in form and the -band 4 passes substantially centrally or axially through the bodies to accommodatev a different type of pulley groove with which the 'belt may be used. In the form shown in Figures 4 and 5, the frictional bodies 16 are -connected to the band 4 by vulcanization as above described, but the band 4 of this form-of the invention is of substantial width and approaches the width of the frictional bodies 16 with Sullicient thickness of the bodies at the lateral band 4 in this form is'made relatively wide so that the ends of the belt mayfbe rmly secured together. rlhe means utilized for fastening the ends of the band 4 together comprises a pair of clamps 17 and 18 bent at right angles at 20 and between which are fitted a pair of friction blocks 162 and 163. The clamps 17 and 18 may be provided with tongues 21 penetrating the blocks 162 and 163 and may be connected together by a single clamping bclt 19 provided with a nut 22, the bolt extending through semi-cylindrical openings provided in the blocks 162 and 16S. By means of this construction of connecting device the band 4 may be relatively wide to take up the strains transmitted during its operation and the bolt is so located that it may easily follow the band of the belt when the latter traverses a pulley of relatively small diameter and with the least amount of resistance.v l

In Figures 6 and 7 a modified form of the connector is shown and wherein the blocks 162 and 16s may be provided with two openings 23 for the reception of clamping bolts i 19 and 192.

Referring now particularly to Figures 9, 10, and 11, the band 4 is construct/ed of an upper part A and a lower part B which may be vulcanized separately or independently on the band 4, and when this is done a thin cloth band C may be vulcanized about the elements A, 4 and B so that the thickness only of the band C remains beyond the outer edges of the band 4. This thickness of the reinforcing or binding band C is so small, as compared with the width of the belt, that it is practically negligible. lThis structure provides la frictional body 16 which is built up of fabric impregnated with rubber similar to that of the band 4 in order to equalize and distribute the strain imposed on the belt and to thus insure the even wear on all parts or' the kbelt structure.

.In Figures 9, 10 and 11 itwill be noted that if desired a layer D of ure rubber may be inserted between 'the and 4 and the frictional body sections A and B so as to provide the necessary cushioning and gripping action of the bodies 16 as they pass over pulleys. By means of this structure, when the belt passes over pulleys, the inner part B will be compressed while the outer part A of each frictional body 16 will be stretched to some extent. According to this invention all forms shown may be constructed of rubber or a composition thereof, although the fabric layers are preferably used where the belt is subjected to considerable strain and rough usage.

From the' foregoing description considered in connection with the accompanying drawin s, the construction and the advantages o the invention will be readily understood. Although, Ihave herein described some practical embodiments of my inven- Lamaze tion, which have given highly satisfactory results in actual use, it is nevertheless to be understood, that the essential features of my improvements might likewise be cmbodied in numerous other alternative constructions. Accordingly therefore, the privparts as may be fairly considered within the spirit and scope of the invention as claimed.

What 1 claim is:

1. 1n a lf-type belt, the combination of a plurality of rubber impregnated 'fabric strips adapted to resist driving strains, and rubber containing rictional bodies spaced. apart along the strips on both sides in a directly superimposed order, the said frictional bodies surrounding the strips in the form of a frame, the whole being vulcanized together.

2. 1n a V-type belt, the combination ci a plurality of rubber impregnated fabric strips adapted to resist driving strains, and rubber containing rictional bodies spaced along the strips on both sides in a directly superimposed oider, the said rictional bodies surrounding the strips in the form o' frame, the frame having upper and lower parts and two smaller side parts connecting the said upper and lower parts together, the whole being vulcanized together.

3. In a tf-type belt, the combination ci' a plurality of rubber impregnated fabric strips adapted to resist driving strains, and rubber containing rictional bodies spaced yalong the strips on both sides in a directly superimposed order, the said frictional bodies surrounding the strips in the form of a frame, the latter being formed by an upper and a lower part and by two smaller side parts connecting the said upper and lower parts together, the said upper and lower parts and the said side parts being built up by rubber impregnated fabric strips, the said strips passing through the said side parts and the whole being vulcanized together.

4. In a V-type belt, the combination of a plurality of rubber impregnated fabric strips adapted to resist driving strains, rubber containing frictional bodies spaced along the strips on both sides thereot, and in a directly superimposed order, the said {rictional bodies surrounding the strips in the form of a frame, the latter being termed by an upper and a lower part and by two smaller side parts connecting the said upper and lower parts together, the said upper and lower part and the said side parts being built up by rubber impregnated fabric strips, the said strip passing through the said side parts, `and an intermediate layer or" pure rubber being interposed between the belt lll ond tbe upper and lower part of the frictioiliol body, the whole being vulcanized toget er,

5. Vln ell-type belt, tbe combination of a 5'- plnrnlity of rubber impregnated fabric strips ndnpted to resist driving strains,- rubber eontnininw` trictional bodies spaced along the strips ontli sides in@ directly superimposed order, tbe said trictionnl bodies surrounding the strips in tbe form ot o freine, tbe letter beingI :tormed fby en upper end n lower port end by two smnllerside parte connecting tbe said npper end lower parte together tbe seid upper ond lower parte and the said side parts being built up by rubber l impregnated fabric stri s, the said strip passin through the sai side parts, an i11- terme inte loyer of pure rubber inter osed between the strips and' tbe upper' and ower parts of tbe frictional body, e fastener for the ends of the strips having' two clamps -one above and the other below the strips,`

the said 'clamps being superimposed on two halves ot the end frictionnl bodies and screws securing tbe clamps in place..

ln testimony that l olnim tbe foregoing es my invention l have signed my name.. .RUDOLF RUDERWALM 

